$13.$ The process of combining unsaturated hydrocarbons to form larger molecules is known as:

a$)$ Cracking

b$)$ Reforming

c$)$ Alkylation

d$)$ Polymerization

$14.$ Which of the following is a product of alkylation?

a$)$ Gasoline

b$)$ Diesel

c$)$ Asphalt

d$)$ Lubricating oil

$15.$ Which of the following is a light petroleum product?

a$)$ Diesel

b$)$ Gasoline

c$)$ Fuel oil

d$)$ Lubricating oil

$16.$ The refining process used to convert low$-$octane hydrocarbons into high$-$octane components is called:

a$)$ Cracking

b$)$ Reforming

c$)$ Alkylation

d$)$ Isomerization